//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// SPDX-FileCopyrightText: Copyright (c) 2023 NVIDIA CORPORATION & AFFILIATES.
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCUDACXX___TUPLE_SFINAE_HELPERS_H
#define _LIBCUDACXX___TUPLE_SFINAE_HELPERS_H

#ifndef __cuda_std__
#  include <__config>
#endif // __cuda_std__

#include "../__fwd/tuple.h"
#include "../__tuple_dir/make_tuple_types.h"
#include "../__tuple_dir/tuple_element.h"
#include "../__tuple_dir/tuple_like.h"
#include "../__tuple_dir/tuple_size.h"
#include "../__tuple_dir/tuple_types.h"
#include "../__type_traits/enable_if.h"
#include "../__type_traits/integral_constant.h"
#include "../__type_traits/is_assignable.h"
#include "../__type_traits/is_constructible.h"
#include "../__type_traits/is_convertible.h"
#include "../__type_traits/is_same.h"
#include "../__type_traits/remove_cvref.h"
#include "../__type_traits/remove_reference.h"
#include "../cstddef"

#if defined(_CCCL_IMPLICIT_SYSTEM_HEADER_GCC)
#  pragma GCC system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_CLANG)
#  pragma clang system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC)
#  pragma system_header
#endif // no system header

_LIBCUDACXX_BEGIN_NAMESPACE_STD

template <bool... _Preds>
struct __all_dummy;

template <bool... _Pred>
using __all = _IsSame<__all_dummy<_Pred...>, __all_dummy<((void) _Pred, true)...>>;

struct __tuple_sfinae_base
{
  template <class, class>
  struct __test_size : false_type
  {};

  template <class... _Tp, class... _Up>
  struct __test_size<__tuple_types<_Tp...>, __tuple_types<_Up...>> : _BoolConstant<sizeof...(_Tp) == sizeof...(_Up)>
  {};

  template <template <class, class...> class, class _Tp, class _Up, bool = __test_size<_Tp, _Up>::value>
  struct __test : false_type
  {};

  template <template <class, class...> class _Trait, class... _LArgs, class... _RArgs>
  struct __test<_Trait, __tuple_types<_LArgs...>, __tuple_types<_RArgs...>, true>
      : __all<_Trait<_LArgs, _RArgs>::value...>
  {};

  template <class _FromArgs, class _ToArgs>
  using __constructible = __test<is_constructible, _ToArgs, _FromArgs>;
  template <class _FromArgs, class _ToArgs>
  using __convertible = __test<is_convertible, _FromArgs, _ToArgs>;
  template <class _FromArgs, class _ToArgs>
  using __assignable = __test<is_assignable, _ToArgs, _FromArgs>;
};

// __tuple_convertible

template <class _Tp, class _Up, bool = __tuple_like<__libcpp_remove_reference_t<_Tp>>::value,
    bool = __tuple_like<_Up>::value>
struct __tuple_convertible : public false_type
{};

template <class _Tp, class _Up>
struct __tuple_convertible<_Tp, _Up, true, true>
    : public __tuple_sfinae_base::__convertible<__make_tuple_types_t<_Tp>, __make_tuple_types_t<_Up>>
{};

// __tuple_constructible

template <class _Tp, class _Up, bool = __tuple_like<__libcpp_remove_reference_t<_Tp>>::value,
    bool = __tuple_like<_Up>::value>
struct __tuple_constructible : public false_type
{};

template <class _Tp, class _Up>
struct __tuple_constructible<_Tp, _Up, true, true>
    : public __tuple_sfinae_base::__constructible<__make_tuple_types_t<_Tp>, __make_tuple_types_t<_Up>>
{};

// __tuple_assignable

template <class _Tp, class _Up, bool = __tuple_like<__libcpp_remove_reference_t<_Tp>>::value,
    bool = __tuple_like<_Up>::value>
struct __tuple_assignable : public false_type
{};

template <class _Tp, class _Up>
struct __tuple_assignable<_Tp, _Up, true, true>
    : public __tuple_sfinae_base::__assignable<__make_tuple_types_t<_Tp>, __make_tuple_types_t<_Up&>>
{};

template <size_t _Ip, class... _Tp>
struct _LIBCUDACXX_TEMPLATE_VIS tuple_element<_Ip, tuple<_Tp...> >
{
  typedef _LIBCUDACXX_NODEBUG_TYPE __tuple_element_t<_Ip, __tuple_types<_Tp...>> type;
};

template <bool _IsTuple, class _SizeTrait, size_t _Expected>
struct __tuple_like_with_size_imp : false_type
{};

template <class _SizeTrait, size_t _Expected>
struct __tuple_like_with_size_imp<true, _SizeTrait, _Expected> : integral_constant<bool, _SizeTrait::value == _Expected>
{};

template <class _Tuple, size_t _ExpectedSize, class _RawTuple = __remove_cvref_t<_Tuple>>
using __tuple_like_with_size _LIBCUDACXX_NODEBUG_TYPE =
    __tuple_like_with_size_imp< __tuple_like<_RawTuple>::value, tuple_size<_RawTuple>, _ExpectedSize >;

struct _LIBCUDACXX_TYPE_VIS __check_tuple_constructor_fail
{
  template <int&...>
  using __enable_explicit_default = false_type;
  template <int&...>
  using __enable_implicit_default = false_type;
  template <class...>
  using __enable_explicit = false_type;
  template <class...>
  using __enable_implicit = false_type;
  template <class...>
  using __enable_assign = false_type;
};

#if _LIBCUDACXX_STD_VER > 11

template <bool _CanCopy, bool _CanMove>
struct __sfinae_ctor_base
{};
template <>
struct __sfinae_ctor_base<false, false>
{
  __sfinae_ctor_base()                                     = default;
  __sfinae_ctor_base(__sfinae_ctor_base const&)            = delete;
  __sfinae_ctor_base(__sfinae_ctor_base&&)                 = delete;
  __sfinae_ctor_base& operator=(__sfinae_ctor_base const&) = default;
  __sfinae_ctor_base& operator=(__sfinae_ctor_base&&)      = default;
};
template <>
struct __sfinae_ctor_base<true, false>
{
  __sfinae_ctor_base()                                     = default;
  __sfinae_ctor_base(__sfinae_ctor_base const&)            = default;
  __sfinae_ctor_base(__sfinae_ctor_base&&)                 = delete;
  __sfinae_ctor_base& operator=(__sfinae_ctor_base const&) = default;
  __sfinae_ctor_base& operator=(__sfinae_ctor_base&&)      = default;
};
template <>
struct __sfinae_ctor_base<false, true>
{
  __sfinae_ctor_base()                                     = default;
  __sfinae_ctor_base(__sfinae_ctor_base const&)            = delete;
  __sfinae_ctor_base(__sfinae_ctor_base&&)                 = default;
  __sfinae_ctor_base& operator=(__sfinae_ctor_base const&) = default;
  __sfinae_ctor_base& operator=(__sfinae_ctor_base&&)      = default;
};

template <bool _CanCopy, bool _CanMove>
struct __sfinae_assign_base
{};
template <>
struct __sfinae_assign_base<false, false>
{
  __sfinae_assign_base()                                       = default;
  __sfinae_assign_base(__sfinae_assign_base const&)            = default;
  __sfinae_assign_base(__sfinae_assign_base&&)                 = default;
  __sfinae_assign_base& operator=(__sfinae_assign_base const&) = delete;
  __sfinae_assign_base& operator=(__sfinae_assign_base&&)      = delete;
};
template <>
struct __sfinae_assign_base<true, false>
{
  __sfinae_assign_base()                                       = default;
  __sfinae_assign_base(__sfinae_assign_base const&)            = default;
  __sfinae_assign_base(__sfinae_assign_base&&)                 = default;
  __sfinae_assign_base& operator=(__sfinae_assign_base const&) = default;
  __sfinae_assign_base& operator=(__sfinae_assign_base&&)      = delete;
};
template <>
struct __sfinae_assign_base<false, true>
{
  __sfinae_assign_base()                                       = default;
  __sfinae_assign_base(__sfinae_assign_base const&)            = default;
  __sfinae_assign_base(__sfinae_assign_base&&)                 = default;
  __sfinae_assign_base& operator=(__sfinae_assign_base const&) = delete;
  __sfinae_assign_base& operator=(__sfinae_assign_base&&)      = default;
};
#endif // _LIBCUDACXX_STD_VER > 11

_LIBCUDACXX_END_NAMESPACE_STD

#endif // _LIBCUDACXX___TUPLE_SFINAE_HELPERS_H